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Cadaclysm
A CAD geometry library: readers for STEP, IFC, 3DM, IGES, BREP, SAT and OpenSCAD, an exact B-rep modelling kernel, a mesher with levels of detail and a STEP writer. One C ABI, wrappers for Python, C#, Go, Java, Node.js, Rust and C++, plugins for Unreal Engine, Unity and Godot, and a build for the browser.
CAD kernel and readers Website · GitHub · Discord -

glTFRuntime
Load glTF assets into Unreal Engine at runtime: static and skeletal meshes, animations, materials, from disk, memory or the network.
Unreal Engine plugin Fab · GitHub · Discord -

LuaMachine
Lua scripting for Unreal Engine: sandboxed Lua states as assets, exposed to Blueprints and C++, for modding and live game logic.
Unreal Engine plugin Fab · GitHub · Discord -

MathVM
A small virtual machine for maths expressions in Unreal Engine: evaluate and plot formulas at runtime, in parallel.
Unreal Engine plugin Fab · GitHub · Discord -

UnrealSyslog
Ship Unreal Engine logs to syslog servers (RFC 3164 and RFC 5424 over UDP), so dedicated servers and builds in the field report back to one place.
Unreal Engine plugin Fab · GitHub · Discord